Problem 2. Answer the following questions using the water-ethanol T-xyz diagram: o Dound De Vapor.Liguid Equilbrium Mixture of Ehanoi and Water 374 P-101.325 KPa 372 370 Vapor Composition 364 350 Azeotropic Pont 356 354 Liquid Composition 352 350 01 02 04 Pure 04 07 Mole Fraction of Ethanol (molimal Pure Ethanol Waer For a liquid mixture of ethanol (1) and water (2) at z-0.3: A) The temperature of the initial mixture should be less than what value? And why? B) What is the bubble point temperature, and what happens at bubble-T? C) What will be the dew point T? And at dew-T, what will be the vapor composition? D) If the T is increased to 358K, what will be the phase of the mixture? Determine vapor and liquid phase compositions? If initially there were 3 moles ethanol molecules, how many moles of ethanol and water molecules would be in the vapor and liquid phases at 358K? Answers: A) Liquid phase, T should be less than -355K. B) Bubble point T is around 355K. This is the T at which first vapor phase is seen. C) Dew point T is around 365K. This is the T at which all liquid evaporates. There would be only vapor phase. The composition of ethanol and water in the vapor would be the same (0.3, and 0.7 respectively). D) From the ethanol-water T-xyz diagram, x-0.13, x 0.87, y-0.48, y: 0.52. Using Eqn 18 from Lecture Notes # 6, V/L-(2-x,V(y-z)- (0.3-0.13)/(0.48-0.3)-0.944 (i=ethanol. Note you can also use water composition; the results should be the same). V/L-0.944; V+L=10 moles: From these equations L=5,14 moles, V-4.86 moles.
Problem 2. Answer the following questions using the water-ethanol T-xyz diagram: o Dound De Vapor.Liguid Equilbrium Mixture of Ehanoi and Water 374 P-101.325 KPa 372 370 Vapor Composition 364 350 Azeotropic Pont 356 354 Liquid Composition 352 350 01 02 04 Pure 04 07 Mole Fraction of Ethanol (molimal Pure Ethanol Waer For a liquid mixture of ethanol (1) and water (2) at z-0.3: A) The temperature of the initial mixture should be less than what value? And why? B) What is the bubble point temperature, and what happens at bubble-T? C) What will be the dew point T? And at dew-T, what will be the vapor composition? D) If the T is increased to 358K, what will be the phase of the mixture? Determine vapor and liquid phase compositions? If initially there were 3 moles ethanol molecules, how many moles of ethanol and water molecules would be in the vapor and liquid phases at 358K? Answers: A) Liquid phase, T should be less than -355K. B) Bubble point T is around 355K. This is the T at which first vapor phase is seen. C) Dew point T is around 365K. This is the T at which all liquid evaporates. There would be only vapor phase. The composition of ethanol and water in the vapor would be the same (0.3, and 0.7 respectively). D) From the ethanol-water T-xyz diagram, x-0.13, x 0.87, y-0.48, y: 0.52. Using Eqn 18 from Lecture Notes # 6, V/L-(2-x,V(y-z)- (0.3-0.13)/(0.48-0.3)-0.944 (i=ethanol. Note you can also use water composition; the results should be the same). V/L-0.944; V+L=10 moles: From these equations L=5,14 moles, V-4.86 moles.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Problem 2. Answer the following questions using the water-ethanol T-xyz diagram:
Duta taken fom Dotund Da ak
Vapor-Liquid Equilibrium
Mixture of Ethanol and Water
374
P-101.325 kPa
372
370
368
366
Vapór Composition
364
K362
360
358-
Azeotropic
Point
356
354
Liquid Composition
352
350
15
0.7
Pure
Mole Fraction of Ethanal (molmol
Pure
Ethanol
Water
For a liquid mixture of ethanol (1) and water (2) at z=0.3:
A) The temperature of the initial mixture should be less than what value? And why?
B) What is the bubble point temperature, and what happens at bubble-T?
C) What will be the dew point T? And at dew-T, what will be the vapor composition?
D) If the T is increased to 358K, what will be the phase of the mixture? Determine vapor and liquid phase
compositions? If initially there were 3 moles ethanol molecules, how many moles of ethanol and water
molecules would be in the vapor and liquid phases at 358K?
Answers:
A) Liquid phase, T should be less than -35SK.
B) Bubble point T is around 355K. This is the T at which first vapor phase is seen.
C) Dew point T is around 365K. This is the T at which all liquid evaporates. There would be only vapor
phase. The composition of ethanol and water in the vapor would be the same (0.3, and 0.7 respectively).
D) From the ethanol-water T-xyz diagram, x=0.13, x=0.87, yı=0.48, y:=0.52.
Using Eqn 18 from Lecture Notes # 6, VIL-(z-x,V(y-z.)= (0.3-0.13)V(0.48-0.3)= 0.944 (i-ethanol. Note
you can also use water composition; the results should be the same). V/L=0.944; V+L=10 moles: From
these equations L=5.14 moles, V=4.86 moles.
Ethanol: # moles in the vapor-4.86*0.48-2.333, # moles in the liquid: 5.14*0.13=0.668
Water: # moles in the vapor-4.86*0.52=2.572 , # moles in the liquid: 5.14*0.87=4.472
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